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According to the ad in the 1915 American Carpenter and Builder (trade magazine), this “lumber” was made with Portland Cement and asbestos, and the final product could be sawed, drilled or screwed - just like regular lumber.

I’d love to know more about this product!

Asbestos Lumber: It's two great products in one!

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And in 2012, the EPA considers asbestos one of the "great disasters."

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Picture of a school gymnasium in New York with this radical new product.